Sanderson brown



S. BROWN. Steam Boiler..

" NITED STATES PATENT Onrust;Q

SANDERSON BROWN, OF HOPE VALLEY, RHODE ISLAND.

`STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 228,978, datedv June 22, 1880,

Application filed January 9, 1880.

To all whom it may concern:

Be it known that I, SANDERsoN BROWN, of Hope Valley, in the county of Washington and State of Rhode Island, have invented certain new and useful Improvements in Steam- Boilers,of which the following is a specification.

The object of this improvement is tou facilitate the production of steam by causing the products of combustion to circulate among annular water-tubes and apply externally beneath the shell of an elevated tubular boiler, afterward to pass longitudinally through the interior of such tubes, and subsequently to pass off through the ilues of the aforesaid tubular boiler; and it consists in the arrangement and combination of devices described in the following specification and pointed out in the claims, reference being had to the annexed draw-ings, of which- Figure l is a side view, partly in longitudinal section, showing the arrangement of the several parts; and Fig. 2, an end view, partly in section.

A is the grate or bed for the fuel; B B, a series of water-tubes, each having an interior tube, C, open at both ends, and forming a Hue through which the caloric-current passes. An annular water-space is therefore formed within each tube B, and the water therein contained is subjected to heat both from without and within, and consequentlyis very rapidly heated and speedily converted into steam.

rllhe ends of the tubes B are connected by steam-tight joints with the hollow metallic walls D D, also containing water, or with one or more pipes leading up to a tubular boiler or steam generator, E, placed horizontally directly over the annular tubes B G and in the same vertical plane, so that the llames will act externally upon both at the same -time and while at their greatest intensity. The flues G extend through the walls D, so as 'to leave an open passage for the smoke and flames.

F represents a feed-water pipe connecting with the watersupply, whereby a constant circulation is secured, the water gradually rising in the pipes B as it is heated, and ascending, when at or near the boiling-point, to the elevated boiler E, and passing 0E in steam;

Gr is a breast-wall or barrier, through which the pipes B pass and by which they are supported centrally. It is located at the rear of the ire-box, and serves to direct the course of the dames, lengthen their circuit, and cause the heated current to follow the direction indicated by the arrows or to pass upwardly among the tubes B, then along horizontally beneath the boiler E, and downwardly between the annular tubes again. The products of combustion thenenter the flues C at their lower ends, emerge at their upper ends, and pass through the lues H of the horizontal boiler to the chimney I.

It will be obvious from this description that the heat acts in the most direct and positive t manner upon the water contained in the tubes B and boiler E, and that the production of steam will be very rapid, the water reaching the Water-space D in the boiler almost or quite in a state of ebullition, and being there subjected to the inuence of the flames below and of the heated current through the iiues H. The arrangement of the boiler E directly over and in a plane parallel with that ofthe tubes B C enables me thus to utilize the heat to the utmost.

I am aware that annular heating-tubes are not broadly new, and I make no claim to such tubes separately considered. I also disclaim the independent use of tubular boilers with horizontal lues, as in common use, and Ilimit myself to apparatus in which the products of combustion apply extern ally both to the annular tubes and to the superposed tubular boiler, then pass longitudinally through the interior of the annular tubes, and subsequently pass, in like manner, through the iiues of the elevated boiler. By such application. of the caloric current I am able to produce more steamV with a given amount of fuel than can be made under any other arrangement.

Having thus described my improvements in steam-boilers, I claim- 1. The combination of a series of inclined concentric tubes with a horizontal tubular boiler suitably connected therewith and located directly above them in the same vertical plane,

wherebythe heat is utilized to the utmost, substantially as and for the purposes herein set forth.

2. A series of inclined annular water-tubes Soi IOO

placed above the lire-grate, in combination for circulation by the hollow Walls D, in coin- With ahorizontal tubular boiler placed above bination with the barrier G, arranged to carry said annular tubes in a plane parallel therethe heat more powerfully into contact with the with, as shown, and suitable means of eonnecexterior of the boiler E, substantially as and 5 tion between said parts and the Water-supply, for the purposes herein set forth.

whereby a constant circulation is secured sub stantially as and for the purposes hereill set SANDERS ON BROWN' forth. Witnesses:

3. The series of tubes B C and boiler E, ar- J. G. PERRY,

1 o ranged in the same vertical plane and connected H. B. PERRY. 

